Sinn U1000 - EZM6

Par Florian Matrion, le 10 octobre 2011
U1000 - EZM6
U1000 - EZM6
The Sinn U1000 comes out from the depths to visit the offices of TWO. The Frankfurt firm has put all of its know-how into an extreme diver's chronograph that is both technical and practical. Review.
Exclusive! review of the U1000 - EZM6. Manufacturer data, photos, editor's opinion and watch retail price on
L'avis de la rédaction
Note des internautes

Slideshow = 15 photos to show this watch in all of its angles



Sinn was launched fifty years ago with watches that were originally designed for race car drivers and pilots.

With its keen interest in technical watches, the company quickly expanded and started offering diver's watches, which resulted in the complete range of rugged-looking watches, like the U1 (already reviewed here by TWO), or the UX, a "balanced pressure" watch capable of working in any depth.

With the U1000, Sinn takes on the challenge of making a diving chronograph, designing it like a technical instrument, and focusing on two main objectives: sturdiness and practical features.


A sturdy watch

The sturdiness of the U1000 is ensured in multiple ways, and its pressure-resistance up to 1,000 meters is the first pledge of this test.

While many models currently available on the market manage to maintain an equivalent water-resistance, very few of them are equipped with a chronograph that actually works at that depth, even if some will say that a chronograph is not essential tool to have on a diver's watch!

This achievement is moreover officially certified by Lloyd in Hamburg, a testament to the seriousness of the endeavor.

As yet another sign of sturdiness, the case is made of steel actually used to build submarines, a material that Sinn uses for all its diver's watches.
The steel is also coated with Tegiment.


With the U1000, Sinn takes on the challenge of making a diving chronograph, designing it like a technical instrument.

The end result is a watch that is particularly resistant to the damage caused by sea water, and also to the numerous hits and bumps that are a common diving experience.

Also worth noting, the achieved level of scratch resistance is above 1,200 Vickers, versus 300 for standard steel.

The other exposed components, like the crown, bezel, or the push-buttons are all oversized. They convey a strong sense of sturdiness, and are clearly ready to face the toughest diving challenges.

Still, within this tough-looking package, one barely-visible element seems to have been somewhat neglected as part of that concept, namely, the bracelet attachments.
Indeed, the pins are rather small.

Given the attention and care given to the rest, it's somewhat surprising to find such a part on this type of watch.
What a pity!


Excellent readability

The watch's readability is at the top of its list of features.

It is quite simply excellent in any and all situations, and particularly so underwater.
The contrast is very good in daylight, and the SuperLumiNova kicks in very quickly as the light starts to fade.

The reading of the passing time on the bezel is a little less effective, primarily because of the weaker contrasts.
Those for whom this is more of an issue will find this problem improved in the SDR version of this model (equipped with a black bezel).

But readability is not simply a matter of contrasts.
In order to improve the chronograph's readability, Sinn decided to increase the size of the minutes' subdial, and modify it so it covers 60 min. instead of just 30. This change allows for a fast and instinctive reading of the time on the chronograph.

Finally, in order to preserve this great readability, the thick sapphire is domed and coated with an efficient anti-glare material on both sides.


The push-buttons are on the left side, and while this unusual layout isn't very pleasing aesthetically, it turns out to be quite handy.

A practical watch

In action, this chronometer reveals itself to be well thought-through.

The bezel is unidirectional, in a classical style.
But you have to apply a slight vertical push in order to set it.
This prevents any involuntary handling.

The push-buttons are on the left side, and while this unusual layout isn't very pleasing aesthetically, it turns out to be quite handy.

Indeed, this allows first for minimum exposure of the push pieces to various impacts, and second, it also protects the back of the hand from these imposing outgrowths.



Too imposing, maybe?
From a practical standpoint, the answer is no: with gloves on, and in temperature conditions that are sometimes uncomfortable, the handling of the push-buttons is never a problem, and their triggering with the thumb (because of their location) quickly becomes natural.

The silicon strap - usually a weak point in a diver's watch - is solid, flexible, and pleasant to wear.
The folding clasp is made of Tegiment steel, same as the case.
It has a classic extension allowing you to increase the length of your Sinn's strap, and wear it over a wetsuit.
A word of warning, though: as is often the case with watches which are equipped with a rubber strap with a folding clasp, you'll have to cut the bracelet in order to fit it to your wrist. So, remember to do this very progressively!

There is however a significant drawback: we really miss the ability to fine-tune the strap since the extension increases the size of this wristband by 7mm without any option to modulate.
In other words, it's either 0mm, or +7mm!
An adjustable extension will have been a better choice for a technical model of this kind.

Finally, a few words on the finish.
Sinn has not forgotten about those.
The hands, the dial, and the coating on the case are all beautifully made.
The paint work on the dial is very precise, and the SuperLumiNova is applied consistently and uniformly.

Thus, at first sight, the whole tool aspect of the watch comes out quite clearly.
But the craftsmanship is also clearly visible when you start looking more closely at the details.


The silicon strap - usually a weak point in a diver's watch - is solid, flexible, and pleasant to wear.


Let's end with the caliber.
The SZ02 that is used on the U1000 is actually a Valjoux 7750 that has been customized by Sinn.

While the main characteristics are present, including the known robustness, but also the firm release which is partially compensated by the size of the push-buttons, Sinn has modified this movement so it can display the chronograph time on a subdial graduated over 60 minutes.

Another homemade modification, the lubrication is done using special oils that maintain a constant viscosity so that the functioning remains unchanged between -45 and +80 degrees Celsius.



One last classic element used by Sinn is the filling of the watch case with Argon, which provides a better environment for the oils, and thus increases their longevity.
A warning indicator located at 4 o'clock on the side of the case allows you to see the aging of the oils; when the indicator turns dark blue, it's time for a maintenance check.



In the world of diver's watches, some are so multi-purpose that they will not stand out when you're wearing a suit. The Sinn U1000 is definitely not one of those watches!
It was entirely conceived as a diver's watch, and many of its strong underwater characteristics could be easily perceived as flaws on firm ground, but if you are a demanding diver with high standards and/or a connoisseur of technical watches, this U1000 will be more than happy to seduce you.



  • a pure diver's watch
  • excellent readability
  • very practical



  • a watch that is difficult to wear out of the water
  • no ability to fine-tune the strap extension
  • the strap attachments


Additional information:

  • the advertised price in the manufacturer's spec sheet is the watch's official retail price in France at the time of this review's publication on the French version
  • reviewer/tester's wrist size = 17.5cm
15 Photos pour voir cette montre sous toutes les coutures
Cliquez sur une Photo pour ouvrir le diaporama.
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Données constructeur

Référence constructeur
Boîtier (matière)
Diamètre boîtier (hors couronne)
Diamètre boîtier (avec couronne)
Base calibre
Capacité de la réserve de marche
Fond transparent
Longueur corne à corne
Hauteur boîtier
Bracelet (matière)
Boucle (type)
Boucle (matière)
Poids total

L'avis de la rédaction 69/100

Confort / Agrément (/15)
détail Mouvement (/20)
Optimisation / Décoration du mouvement (/5) 0
Agrément de manipulation et de réglage (/5) 0
Contrôle du mouvement par la Manufacture / distinctions diverses (/3) 0
Capacité de la réserve de marche (/2) 0
Complications (/5) 0
détail Finitions (/20)
Finitions cadran (/6) 0
Finitions boîtier (/6) 0
Qualité du travail de déco° / gravure du fond de boîte (/2) 0
Qualité du verre (/4) 0
Finitions de la boucle (interne et externe) (/2) 0
détail Fonctionnalité (/20)
Lisibilité diurne (/5) 0
Lisibilité nocturne (/4) 0
Etanchéité (/3) 0
Facilité de réglage et de changement du bracelet (/4) 0
Sécurité / solidité de la boucle (/4) 0
détail Bonus (/10)
Série limitée (/3) 0
Montre fournie avec plusieurs bracelets (/2) 0
Qualité de la boîte et de la sur-boîte (/1) 0
Portabilité avec manches de chemise fermées (/2) 0
Présence de "goodies" (/1) 0
Intelligibilité du booklet (/1) 0
Rapport qualité / prix (/15)
Pour quelles occasions ? Quand la porter ?

Note des internautes 80/100

Confort / Agrément (/15)
Mouvement (/20)
Finitions (/20)
Fonctionnalité (/20)
Bonus (/10)
Rapport qualité / prix (/15)
Noter cette montre